001: /*--
002:
003: $Id: NegateFilter.java,v 1.3 2004/02/06 09:28:31 jhunter Exp $
004:
005: Copyright (C) 2000-2004 Jason Hunter & Brett McLaughlin.
006: All rights reserved.
007:
008: Redistribution and use in source and binary forms, with or without
009: modification, are permitted provided that the following conditions
010: are met:
011:
012: 1. Redistributions of source code must retain the above copyright
013: notice, this list of conditions, and the following disclaimer.
014:
015: 2. Redistributions in binary form must reproduce the above copyright
016: notice, this list of conditions, and the disclaimer that follows
017: these conditions in the documentation and/or other materials
018: provided with the distribution.
019:
020: 3. The name "JDOM" must not be used to endorse or promote products
021: derived from this software without prior written permission. For
022: written permission, please contact <request_AT_jdom_DOT_org>.
023:
024: 4. Products derived from this software may not be called "JDOM", nor
025: may "JDOM" appear in their name, without prior written permission
026: from the JDOM Project Management <request_AT_jdom_DOT_org>.
027:
028: In addition, we request (but do not require) that you include in the
029: end-user documentation provided with the redistribution and/or in the
030: software itself an acknowledgement equivalent to the following:
031: "This product includes software developed by the
032: JDOM Project (http://www.jdom.org/)."
033: Alternatively, the acknowledgment may be graphical using the logos
034: available at http://www.jdom.org/images/logos.
035:
036: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
040: CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: SUCH DAMAGE.
048:
049: This software consists of voluntary contributions made by many
050: individuals on behalf of the JDOM Project and was originally
051: created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
052: Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
053: on the JDOM Project, please see <http://www.jdom.org/>.
054:
055: */
056:
057: package org.jdom.filter;
058:
059: /**
060: * Filter that is the logical <b>negation</b> operation of another filter.
061: *
062: *
063: * @author Bradley S. Huffman
064: * @version $Revision: 1.3 $, $Date: 2004/02/06 09:28:31 $
065: */
066: final class NegateFilter extends AbstractFilter {
067:
068: private static final String CVS_ID = "@(#) $RCSfile: NegateFilter.java,v $ $Revision: 1.3 $ $Date: 2004/02/06 09:28:31 $";
069:
070: // Underlying filter.
071: private Filter filter;
072:
073: /**
074: * Match if the supplied filter <b>does not</b> match.
075: *
076: * @param filter filter to use.
077: */
078: public NegateFilter(Filter filter) {
079: this .filter = filter;
080: }
081:
082: public boolean matches(Object obj) {
083: return !filter.matches(obj);
084: }
085:
086: public Filter negate() {
087: return filter;
088: }
089:
090: public boolean equals(Object obj) {
091: if (this == obj) {
092: return true;
093: }
094:
095: if (obj instanceof NegateFilter) {
096: return filter.equals(((NegateFilter) obj).filter);
097: }
098: return false;
099: }
100:
101: public int hashCode() {
102: return ~filter.hashCode();
103: }
104:
105: public String toString() {
106: return new StringBuffer(64).append("[NegateFilter: ").append(
107: filter.toString()).append("]").toString();
108: }
109: }
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